问题
单项选择题
A．顺序结构
B．链接结构
C．索引结构
D．Hash结构
答案
参考答案：B
解析：[分析] 常用的文件物理结构有以下3种：顺序结构、链接结构和索引结构。其中链接结构将逻辑上连续的文件分散存放在若干不连续的物理块中，每个物理块设有一个指针，指向其后续的物理块。它不具有直接读写文件任意一个记录的能力。
搜题请搜索小程序“爱下问搜题”
A．顺序结构
B．链接结构
C．索引结构
D．Hash结构
参考答案：B
解析：[分析] 常用的文件物理结构有以下3种：顺序结构、链接结构和索引结构。其中链接结构将逻辑上连续的文件分散存放在若干不连续的物理块中，每个物理块设有一个指针，指向其后续的物理块。它不具有直接读写文件任意一个记录的能力。
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| Professor Barry Wellman of the University of Toronto in Canada has invented a term t o describe the way many North Americans interact (互动) these days. The 1 is "networked individualism". This concept is not 2 to understand because the words seem to have opposite meanings. How can we be individuals and be networked 3 ? You need other people for 4 . Here is 5 Professor Wellman means. 6 the invention of the Internet and e mail, our social networks included 7 interactions with relatives, neighbors and colleagues at work. Some of the 8 was by phone, but it was still voice to voice, person to person, in 9 time. A recent 10 by the Pew Internet and American Life Project 11 that for a lot of people, electronic interaction through the computer has 12 the person-to-person interaction. However, a lot of people interviewed for the Pew's study 13 that's a good thing. Why? In the past, many people were 14 that the Internet isolated (隔离,孤立) us and caused us to 15 too much time in the imaginary world of the computer. But the Pew's study discovered that the 16 is true. The Internet 17 us with more real people than expected- 18 people who can give advice on careers, medical problems, raising children, and choosing a school or college. About 60 million Americans told Pew that the Internet 19 an important role in helping them make major life decisions. Thanks to the computer,"networked individuals" are able to be 20 and together with other people-at the same time! | ||||
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